Ghostery

Here is a video from AdRoll that can serve as an introduction to this concept: https://www.youtube.com/watch?v=...The concept is not unique to Jabong. In fact, most eCommerce websites these days would deploy some form of retargeting mechanism, either built inhouse, or by using a third party tools like Adroll.

And indeed, as seen in screenshot[1] below, Jabong is using Adroll for this purpose.

[1] The results are from a browser extension called Ghostery. If the website is using a popular third party tool for web-analytics, tag-management, ad-serving, or A/B testing, Ghostery will detect it.

Someone from Quora can confirm this, but based on what I have observed, I don't think they are using any third party tool for A/B testing.

I use a tool called Ghostery (browser extension) for this purpose. If the website is using any of the popular third party platforms for web-analytics, tag-management, ad-serving, or A/B testing, Ghostery will be able to detect those. Of course, if you are doing this in-house, it won't detect anything.

This is what Ghostery detected for Quora:

So, it does not appear that they are using any of the popular third party tools.